Resource sharing between paging response and random access channel message

ABSTRACT

Methods, systems, and devices for wireless communication are described. A base station may transmit a paging indicator message to one or more user equipment (UEs) in a group of UEs. The base station may receive, based at least in part on the paging indicator message, a first response message from the one or more UEs. The first response message may be received using a resource that is shared with a random access channel message for the group of UEs. The base station may transmit, based at least in part on the first response message, a second response message to the one or more UEs.

CROSS REFERENCES

The present application for patent claims priority to U.S. ProvisionalPatent Application No. 62/481,633 by Islam, et al., entitled “ResourceSharing Between Paging Response and Random Access Channel Message,”filed Apr. 4, 2017, and to U.S. Provisional Patent Application No.62/502,269 by Islam et al., entitled “Resource Sharing Between PagingResponse and Random Access Channel Message,” filed May 5, 2017 andassigned to the assignee hereof.

BACKGROUND

The following relates generally to wireless communication, and morespecifically to resource sharing between paging response and randomaccess channel message.

Wireless communication systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include code division multiple access (CDMA)systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, and orthogonal frequencydivision multiple access (OFDMA) systems, (e.g., a Long Term Evolution(LTE) system, or a New Radio (NR) system). A wireless multiple-accesscommunications system may include a number of base stations or accessnetwork nodes, each simultaneously supporting communication for multiplecommunication devices, which may be otherwise known as user equipment(UE).

Paging operations provide a mechanism for a base station to page a UEwhen downlink data is available for the UE, when system informationchanges, and the like. Paging operations may include base stationswithin a tracking area, for example, transmitting a paging indicator toa UE in an idle or radio resource control (RRC) inactive mode. The UEmay respond with a paging response indicating that the paging indicatorwas received. The base station (e.g., the base station receiving thepaging response) may respond with a paging message. In some instances,the UE may respond to the paging message by establishing an RRCconnection with the base station, e.g., to exchange information. In oneexample, the RRC connection exchange may include the UE transmitting arandom access channel (RACH) preamble message (e.g., RACH msg1), thebase station responding with a RACH response message (e.g., RACH msg2),the UE responding with a RRC connection request message, and finally thebase station responding with a RRC connection setup message. Other RACHmessages and/or protocols may also be implemented. Conventional wirelesscommunication systems, however, may use separate resources for thepaging operations and the RACH process, which may increase systemoverhead.

SUMMARY

The described techniques relate to improved methods, systems, devices,or apparatuses that support resource sharing between paging responsesand random access channel (RACH) messages. Generally, the describedtechniques provide for shared resources between paging messages and RACHmessages. For example, a subset of RACH preamble resources are reservedfor both paging responses and RACH transmissions. A UE may receive apaging indicator from the base station and use the shared resources whentransmitting a response message (e.g., either a paging response or aRACH message (e.g., RACH msg1)). As the base station may not know, orhave any indication of whether the first response message is a pagingresponse or RACH message, the base station may transmit a responsemessage (e.g., a second response message) based on considerations suchas paging load, UE entry rate into the system, and the like. In someexamples, the second response message from the base station may includea paging message (e.g., the base station disregards a RACH msg1 as thefirst response message). As another example, the second response messagefrom the base station may include a RACH msg2. In some aspects, the RACHmsg2 may include additional payload information, such as a pagingmessage. While this example may incur additional overhead due to theadditional bits in RACH msg2, the base station may adopt this approachwhen the UE entry rate into the system is high, e.g., above a threshold.The described techniques provide a mechanism where resources areconserved and the base station varies its response depending on thecurrent system status.

A method of wireless communication is described. The method may includetransmitting, from a base station, a paging indicator message to one ormore UEs in a group of UEs, receiving, based at least in part on thepaging indicator message, a first response message from the one or moreUEs, the first response message received using a resource that is sharedwith a RACH message for the group of UEs, and transmitting, based atleast in part on the first response message, a second response messageto the one or more UEs.

An apparatus for wireless communication is described. The apparatus mayinclude means for transmitting, from a base station, a paging indicatormessage to one or more UEs in a group of UEs, means for receiving, basedat least in part on the paging indicator message, a first responsemessage from the one or more UEs, the first response message receivedusing a resource that is shared with a RACH message for the group ofUEs, and means for transmitting, based at least in part on the firstresponse message, a second response message to the one or more UEs.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to transmit, from a base station, apaging indicator message to one or more UEs in a group of UEs, receive,based at least in part on the paging indicator message, a first responsemessage from the one or more UEs, the first response message receivedusing a resource that is shared with a RACH message for the group ofUEs, and transmit, based at least in part on the first response message,a second response message to the one or more UEs.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to transmit, from a basestation, a paging indicator message to one or more UEs in a group ofUEs, receive, based at least in part on the paging indicator message, afirst response message from the one or more UEs, the first responsemessage received using a resource that is shared with a RACH message forthe group of UEs, and transmit, based at least in part on the firstresponse message, a second response message to the one or more UEs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting an indication of theresource that may be shared between the paging response message and theRACH message.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the indication of the resourcemay be transmitted in at least one of a remaining minimum systeminformation (RMSI), or a master information block (MIB), or an othersystem information (OSI), or a physical downlink control channel(PDCCH), or a physical downlink shared channel (PDSCH), or a radioresource control (RRC) message exchange, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for selecting a format for the secondresponse message based at least in part on a current paging load, an UEentry rate, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining that the first responsemessage comprises a paging response message. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove may further include processes, features, means, or instructionsfor transmitting a paging message as the second response message.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving, based at least in parton the paging message, a RACH msg1 from the one or more UEs. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described above may further include processes, features, means,or instructions for transmitting a RACH msg2 as a third responsemessage.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining that the first responsemessage comprises a RACH msg1. Some examples of the method, apparatus,and non-transitory computer-readable medium described above may furtherinclude processes, features, means, or instructions for transmitting aRACH msg2 as the second response message.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving, based at least in parton the RACH msg2, a message from the one or more UEs, wherein themessage conveys an indication that the one or more UEs may haveresponded to the paging indicator. Some examples of the method,apparatus, and non-transitory computer-readable medium described abovemay further include processes, features, means, or instructions fortransmitting a paging message as a third response message. In someexamples of the method, apparatus, and non-transitory computer-readablemedium described above, the paging message is transmitted in a RACHmessage. In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the RACH message is a RACHpreamble message.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving, based at least in parton the RACH msg2, a RACH msg3 from the one or more UEs. Some examples ofthe method, apparatus, and non-transitory computer-readable mediumdescribed above may further include processes, features, means, orinstructions for transmitting a connection establishment message as athird response message.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting a random accessresponse message as the second response message, wherein the randomaccess response message comprises a paging record. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove may further include processes, features, means, or instructionsfor determining that the first response message comprises a pagingresponse message, wherein the random access response message istransmitted based at least in part on the determining. Some examples ofthe method, apparatus, and non-transitory computer-readable mediumdescribed above may further include processes, features, means, orinstructions for matching a RACH preamble of the first response messageto a set of pre-allocated RACH preambles for a RACH msg1, wherein thedetermining that the first response message comprises a paging responsemessage based at least in part on the matching. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove may further include processes, features, means, or instructionsfor receiving a RACH msg3 from the UE based at least in part on thepaging record being associated with the UE. Some examples of the method,apparatus, and non-transitory computer-readable medium described abovemay further include processes, features, means, or instructions forreceiving a RACH msg3 from the UE that comprises a RACH terminationindication based at least in part on the paging record not beingassociated with the UE.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the paging indicator istransmitted to the group of UEs in a group-specific paging signal.

A method of wireless communication is described. The method may includereceiving, at a UE, an indication of a resource that is shared with aRACH message, receiving, from a base station, a paging indicatormessage, selecting at least one of the paging response message or theRACH message as a first response message to the paging indicatormessage, and transmitting the first response message to the base stationusing the resource.

An apparatus for wireless communication is described. The apparatus mayinclude means for receiving, at a UE, an indication of a resource thatis shared with a RACH message, means for receiving, from a base station,a paging indicator message, means for selecting at least one of thepaging response message or the RACH message as a first response messageto the paging indicator message, and means for transmitting the firstresponse message to the base station using the resource.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to receive, at a UE, an indication ofa resource that is shared with a RACH message, receive, from a basestation, a paging indicator message, select at least one of the pagingresponse message or the RACH message as a first response message to thepaging indicator message, and transmit the first response message to thebase station using the resource.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to receive, at a UE, anindication of a resource that is shared with a RACH message, receive,from a base station, a paging indicator message, select at least one ofthe paging response message or the RACH message as a first responsemessage to the paging indicator message, and transmit the first responsemessage to the base station using the resource.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving a second response messagefrom the base station. Some examples of the method, apparatus, andnon-transitory computer-readable medium described above may furtherinclude processes, features, means, or instructions for selecting, basedat least in part on the second response message, a third responsemessage for transmission to the base station, the third response messagecomprising a RACH msg1, a RACH msg3, or a message conveying anindication that the UE may have responded to the paging indicator.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving the indication of theresource in at least one of a RMSI, or a MIB, or a OSI, or a PDCCH, or aPDSCH, or a RRC message exchange, or a combination thereof.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the paging indicator isreceived in a group-specific paging signal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationthat supports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a process that supports resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure.

FIG. 3 illustrates an example of a flowchart that supports resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a flowchart that supports resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure.

FIG. 5 illustrates an example of a process that supports resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure.

FIG. 6 illustrates an example of a process that supports resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure.

FIGS. 7 through 9 show block diagrams of a device that supports resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure.

FIG. 10 illustrates a block diagram of a system including a base stationthat supports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.

FIGS. 11 through 13 show block diagrams of a device that supportsresource sharing between paging response and random access channelmessage in accordance with aspects of the present disclosure.

FIG. 14 illustrates a block diagram of a system including a UE thatsupports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.

FIGS. 15 through 17 illustrate methods for resource sharing betweenpaging response and random access channel message in accordance withaspects of the present disclosure.

DETAILED DESCRIPTION

Conventional wireless communication systems may use one set of dedicatedresources for paging response messages and a second set of dedicatedresources for random access channel (RACH) messages. For example, a setof paging resources may be reserved and used by UEs for responding topaging indication messages (e.g., for transmitting paging responsemessages). Additionally, a set of RACH preamble resources may bereserved and used by UEs for initiating a radio resource control (RRC)connection establishment procedure. The RACH preamble resources may bereserved for a set of UEs, where UEs select a RACH preamble from thereserved resources for transmitting a RACH preamble message (e.g., msg1)to establish an RRC connection. Such conventional techniques, however,incur substantial overhead due to the different sets of reservedresources.

Aspects of the disclosure are initially described in the context of awireless communication system. For example, resources may be sharedbetween paging messages and RACH messages. The shared resources mayinclude all or a subset of RACH preambles otherwise reserved for a groupof UEs to transmit RACH messages (e.g., RACH msg1). A base station maytransmit an indication to UEs that the resources are being shared. Thebase station may then transmit a paging indicator message to UE(s) andreceive a response message from the UE(s) based on the paging indicator.The response message (e.g., first response message) may be a pagingresponse message or a RACH message (e.g., msg1). The base station maytransmit a second response message to the UE(s) that is selected basedon the first response message from the UE(s). In one example, the secondresponse message may be a paging message (e.g., based on a determinationand/or assumption that the first response message was a paging responsemessage). In another example, the second response message may be a RACHmessage (e.g., a RACH msg2 based on a determination and/or assumptionthat the first response message was a RACH msg1). In some aspects, thebase station may vary how it responds to the first response message(e.g., vary which second response message is transmitted) based onvarious factors, such as a paging load and/or a UE entry rate into thesystem. The UE(s) may receive the indication that resources are sharedand select a format for the first response message accordingly, e.g.,based on whether or not the UE seeks to establish an RRC connection withthe base station.

Aspects of the disclosure are further illustrated by and described withreference to apparatus diagrams, system diagrams, and flowcharts thatrelate to resource sharing between paging response and random accesschannel message.

FIG. 1 illustrates an example of a wireless communication system 100 inaccordance with various aspects of the present disclosure. The wirelesscommunication system 100 includes base stations 105, UEs 115, and a corenetwork 130. In some examples, the wireless communication system 100 maybe a Long Term Evolution (LTE), LTE-Advanced (LTE-A) network, or a NewRadio (NR) network. In some cases, wireless communication system 100 maysupport enhanced broadband communications, ultra-reliable (i.e., missioncritical) communications, low latency communications, and communicationswith low-cost and low-complexity devices.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Each base station 105 may providecommunication coverage for a respective geographic coverage area 110.Communication links 125 shown in wireless communication system 100 mayinclude uplink transmissions from a UE 115 to a base station 105, ordownlink transmissions, from a base station 105 to a UE 115. Controlinformation and data may be multiplexed on an uplink channel or downlinkaccording to various techniques. Control information and data may bemultiplexed on a downlink channel, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, the controlinformation transmitted during a transmission time interval (TTI) of adownlink channel may be distributed between different control regions ina cascaded manner (e.g., between a common control region and one or moreUE-specific control regions).

UEs 115 may be dispersed throughout the wireless communication system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile station, a subscriber station, a mobile unit, asubscriber unit, a wireless unit, a remote unit, a mobile device, awireless device, a wireless communications device, a remote device, amobile subscriber station, an access terminal, a mobile terminal, awireless terminal, a remote terminal, a handset, a user agent, a mobileclient, a client, or some other suitable terminology. A UE 115 may alsobe a cellular phone, a personal digital assistant (PDA), a wirelessmodem, a wireless communication device, a handheld device, a tabletcomputer, a laptop computer, a cordless phone, a personal electronicdevice, a handheld device, a personal computer, a wireless local loop(WLL) station, an Internet of Things (IoT) device, an Internet ofEverything (IoE) device, a machine type communication (MTC) device, anappliance, an automobile, or the like.

In some cases, a UE 115 may also be able to communicate directly withother UEs (e.g., using a peer-to-peer (P2P) or device-to-device (D2D)protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the coverage area 110 of a cell. Other UEs115 in such a group may be outside the coverage area 110 of a cell, orotherwise unable to receive transmissions from a base station 105. Insome cases, groups of UEs 115 communicating via D2D communications mayutilize a one-to-many (1:M) system in which each UE 115 transmits toevery other UE 115 in the group. In some cases, a base station 105facilitates the scheduling of resources for D2D communications. In othercases, D2D communications are carried out independent of a base station105.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines, i.e., Machine-to-Machine (M2M) communication. M2M or MTC mayrefer to data communication technologies that allow devices tocommunicate with one another or a base station without humanintervention. For example, M2M or MTC may refer to communications fromdevices that integrate sensors or meters to measure or captureinformation and relay that information to a central server orapplication program that can make use of the information or present theinformation to humans interacting with the program or application. SomeUEs 115 may be designed to collect information or enable automatedbehavior of machines. Examples of applications for MTC devices includesmart metering, inventory monitoring, water level monitoring, equipmentmonitoring, healthcare monitoring, wildlife monitoring, weather andgeological event monitoring, fleet management and tracking, remotesecurity sensing, physical access control, and transaction-basedbusiness charging.

In some cases, an MTC device may operate using half-duplex (one-way)communications at a reduced peak rate. MTC devices may also beconfigured to enter a power saving “deep sleep” mode when not engagingin active communications. In some cases, MTC or IoT devices may bedesigned to support mission critical functions and wirelesscommunication systems may be configured to provide ultra-reliablecommunications for these functions.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., S1, etc.). Base stations105 may communicate with one another over backhaul links 134 (e.g., X2,etc.) either directly or indirectly (e.g., through core network 130).Base stations 105 may perform radio configuration and scheduling forcommunication with UEs 115, or may operate under the control of a basestation controller (not shown). In some examples, base stations 105 maybe macro cells, small cells, hot spots, or the like. Base stations 105may also be referred to as evolved NodeBs (eNBs) or gNodeBs (105).

A base station 105 may be connected by an S1 interface to the corenetwork 130. The core network may be an evolved packet core (EPC), whichmay include at least one mobility management entity (MME), at least oneserving gateway (S-GW), and at least one Packet Data Network (PDN)gateway (P-GW). The MME may be the control node that processes thesignaling between the UE 115 and the EPC. All user Internet Protocol(IP) packets may be transferred through the S-GW, which itself may beconnected to the P-GW. The P-GW may provide IP address allocation aswell as other functions. The P-GW may be connected to the networkoperators IP services. The operators IP services may include theInternet, the Intranet, an IP Multimedia Subsystem (IMS), and aPacket-Switched (PS) Streaming Service.

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. At least some of the networkdevices, such as base station 105, may include subcomponents such as anaccess network entity, which may be an example of an access nodecontroller (ANC). Each access network entity may communicate with anumber of UEs 115 through a number of other access network transmissionentities, each of which may be an example of a smart radio head, or atransmission/reception point (TRP). In some configurations, variousfunctions of each access network entity or base station 105 may bedistributed across various network devices (e.g., radio heads and accessnetwork controllers) or consolidated into a single network device (e.g.,a base station 105).

Wireless communication system 100 may operate in an ultra-high frequency(UHF) frequency region using frequency bands from 700 MHz to 2600 MHz(2.6 GHz), although some networks (e.g., a wireless local area network(WLAN)) may use frequencies as high as 4 GHz. This region may also beknown as the decimeter band, since the wavelengths range fromapproximately one decimeter to one meter in length. UHF waves maypropagate mainly by line of sight, and may be blocked by buildings andenvironmental features. However, the waves may penetrate wallssufficiently to provide service to UEs 115 located indoors. Transmissionof UHF waves is characterized by smaller antennas and shorter range(e.g., less than 100 km) compared to transmission using the smallerfrequencies (and longer waves) of the high frequency (HF) or very highfrequency (VHF) portion of the spectrum. In some cases, wirelesscommunication system 100 may also utilize extremely high frequency (EHF)portions of the spectrum (e.g., from 30 GHz to 300 GHz). This region mayalso be known as the millimeter band, since the wavelengths range fromapproximately one millimeter to one centimeter in length. Thus, EHFantennas may be even smaller and more closely spaced than UHF antennas.In some cases, this may facilitate use of antenna arrays within a UE 115(e.g., for directional beamforming). However, EHF transmissions may besubject to even greater atmospheric attenuation and shorter range thanUHF transmissions.

Thus, wireless communication system 100 may support millimeter wave(mmW) communications between UEs 115 and base stations 105. Devicesoperating in mmW or EHF bands may have multiple antennas to allowbeamforming. That is, a base station 105 may use multiple antennas orantenna arrays to conduct beamforming operations for directionalcommunications with a UE 115. Beamforming (which may also be referred toas spatial filtering or directional transmission) is a signal processingtechnique that may be used at a transmitter (e.g., a base station 105)to shape and/or steer an overall antenna beam in the direction of atarget receiver (e.g., a UE 115). This may be achieved by combiningelements in an antenna array in such a way that transmitted signals atparticular angles experience constructive interference while othersexperience destructive interference.

Multiple-input multiple-output (MIMO) wireless systems use atransmission scheme between a transmitter (e.g., a base station 105) anda receiver (e.g., a UE 115), where both transmitter and receiver areequipped with multiple antennas. Some portions of wireless communicationsystem 100 may use beamforming. For example, base station 105 may havean antenna array with a number of rows and columns of antenna ports thatthe base station 105 may use for beamforming in its communication withUE 115. Signals may be transmitted multiple times in differentdirections (e.g., each transmission may be beamformed differently). AmmW receiver (e.g., a UE 115) may try multiple beams (e.g., antennasubarrays) while receiving the synchronization signals.

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support beamformingor MIMO operation. One or more base station antennas or antenna arraysmay be collocated at an antenna assembly, such as an antenna tower. Insome cases, antennas or antenna arrays associated with a base station105 may be located in diverse geographic locations. A base station 105may multiple use antennas or antenna arrays to conduct beamformingoperations for directional communications with a UE 115.

In some cases, wireless communication system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use Hybrid ARQ (HARQ) to provideretransmission at the MAC layer to improve link efficiency. In thecontrol plane, the Radio Resource Control (RRC) protocol layer mayprovide establishment, configuration, and maintenance of an RRCconnection between a UE 115 and a network device, base station 105, orcore network 130 supporting radio bearers for user plane data. At thePhysical (PHY) layer, transport channels may be mapped to physicalchannels.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit. Time resources may be organized according to radio frames oflength of 10 ms, which may be identified by a system frame number (SFN)ranging from 0 to 1023. Each frame may include ten 1 ms subframesnumbered from 0 to 9. A subframe may be further divided into two 0.5 msslots, each of which contains 6 or 7 modulation symbol periods(depending on the length of the cyclic prefix prepended to each symbol).Excluding the cyclic prefix, each symbol contains 2048 sample periods.In some cases the subframe may be the smallest scheduling unit, alsoknown as a TTI. In other cases, a TTI may be shorter than a subframe ormay be dynamically selected (e.g., in short TTI bursts or in selectedcomponent carriers using short TTIs).

A resource element may consist of one symbol period and one subcarrier(e.g., a 15 KHz frequency range). A resource block may contain 12consecutive subcarriers in the frequency domain and, for a normal cyclicprefix in each OFDM symbol, 7 consecutive OFDM symbols in the timedomain (1 slot), or 84 resource elements. The number of bits carried byeach resource element may depend on the modulation scheme (theconfiguration of symbols that may be selected during each symbolperiod). Thus, the more resource blocks that a UE receives and thehigher the modulation scheme, the higher the data rate may be.

Wireless communication system 100 may support operation on multiplecells or carriers, a feature which may be referred to as carrieraggregation (CA) or multi-carrier operation. A carrier may also bereferred to as a component carrier (CC), a layer, a channel, etc. Theterms “carrier,” “component carrier,” “cell,” and “channel” may be usedinterchangeably herein. A UE 115 may be configured with multipledownlink CCs and one or more uplink CCs for carrier aggregation. Carrieraggregation may be used with both FDD and TDD component carriers.

In some cases, wireless communication system 100 may utilize enhancedcomponent carriers (eCCs). An eCC may be characterized by one or morefeatures including: wider bandwidth, shorter symbol duration, shorterTTIs, and modified control channel configuration. In some cases, an eCCmay be associated with a carrier aggregation configuration or a dualconnectivity configuration (e.g., when multiple serving cells have asuboptimal or non-ideal backhaul link). An eCC may also be configuredfor use in unlicensed spectrum or shared spectrum (where more than oneoperator is allowed to use the spectrum). An eCC characterized by widebandwidth may include one or more segments that may be utilized by UEs115 that are not capable of monitoring the whole bandwidth or prefer touse a limited bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than otherCCs, which may include use of a reduced symbol duration as compared withsymbol durations of the other CCs. A shorter symbol duration isassociated with increased subcarrier spacing. A device, such as a UE 115or base station 105, utilizing eCCs may transmit wideband signals (e.g.,20, 40, 60, 80 MHz, etc.) at reduced symbol durations (e.g., 16.67microseconds). A TTI in eCC may consist of one or multiple symbols. Insome cases, the TTI duration (that is, the number of symbols in a TTI)may be variable.

A shared radio frequency spectrum band may be utilized in an NR sharedspectrum system. For example, an NR shared spectrum may utilize anycombination of licensed, shared, and unlicensed spectrums, among others.The flexibility of eCC symbol duration and subcarrier spacing may allowfor the use of eCC across multiple spectrums. In some examples, NRshared spectrum may increase spectrum utilization and spectralefficiency, specifically through dynamic vertical (e.g., acrossfrequency) and horizontal (e.g., across time) sharing of resources.

In some cases, wireless communication system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communication system 100 may employ LTE License Assisted Access(LTE-LAA) or LTE Unlicensed radio access technology or NR technology inan unlicensed band such as the 5 Ghz Industrial, Scientific, and Medical(ISM) band. When operating in unlicensed radio frequency spectrum bands,wireless devices such as base stations 105 and UEs 115 may employlisten-before-talk (LBT) procedures to ensure the channel is clearbefore transmitting data. In some cases, operations in unlicensed bandsmay be based on a CA configuration in conjunction with CCs operating ina licensed band. Operations in unlicensed spectrum may include downlinktransmissions, uplink transmissions, or both. Duplexing in unlicensedspectrum may be based on frequency division duplexing (FDD), timedivision duplexing (TDD) or a combination of both.

A base station 105 may be configured to support aspects of the describedtechniques for shared resources. For example, the base station 105 maytransmit a paging indicator message to UE(s) in a group of UEs. The basestation 105 may receive, based at least in part on the paging indicatormessage, a first response message from the UE(s), the first responsemessage received using a resource that is shared with a RACH message forthe group of UE(s). The base station 105 may transmit, based at least inpart on the first response message, a second response message to theUE(s).

A UE 115 may also be configured to support aspects of the describedtechniques for shared resources. For example, the UE 115 may receive anindication of a resource that is shared with a RACH message. The UE 115may receive, from a base station 105, a paging indicator message. The UE115 may select at least one of the paging response message or the RACHmessage as a first response message to the paging indicator message. TheUE 115 may transmit the first response message to the base station 105using the resource (e.g., the shared resource).

FIG. 2 illustrates an example of a process 200 that supports resourcesharing between paging response and RACH message in accordance withvarious aspects of the present disclosure. In some examples, process 200may implement aspects of wireless communication system 100. Process 200may include a base station 205 and a UE 210, which may be examples ofthe corresponding devices described herein. Broadly, process 200illustrates one example of shared paging and RACH message resourcesbetween the base station 205 and the UE 210.

Generally, aspects of process 200 may include base station 205transmitting a paging indication to UE 210. In some aspects, nodedicated preamble is reserved for collecting a response from UE 210.Instead, a subset of RACH preambles (e.g., resources associated with aphysical RACH (PRACH)) are reserved for both paging response and PRACHtransmissions. UE 210 may transmit a response using one of the reservedpreambles. When base station 205 receives the reserved preamble, thebase station 205 may not know whether the preamble is reserved forpaging response of PRACH msg1.

Accordingly, base station 205 may use various choices to respond to thisresponse. One non-limiting choice may include base station 205disregarding the PRACH msg1 that might have used those preambles.Instead, base station 250 may transmit a paging message to the directionfrom where it received the response. If the UE 210 selected thispreamble as a response to the paging indication, UE 210 may receive thepaging message and the system may not incur any additional overhead.

In a second non-limiting choice, base station 205 may transmit a RACHmsg2 to the direction from where it received the response. The RACH msg2payload may contain conventional parameters and, in some instances, mayalso contain paging message information. This may allow the RACH msg2 tobe served for both types of UEs, e.g., UEs that want to RACH to thesystem and UEs that want to receive paging messages corresponding to thepaging indication. This may increase overhead of the system since RACHmsg2 of this procedure may contain additional bits. Thus, in someaspects, base station 205 may vary how it responds to the first responsemessage based on various factors.

At 215, base station 205 may transmit (and UE 210 may receive) anindication of the shared resources. The shared resource indicator maycarry or otherwise convey an indication that the resource is shared,e.g., between a paging response message and a RACH message (e.g., RACHpreamble message/msg1). The shared resource indicator may be transmittedin a remaining minimum system information (RMSI), in a masterinformation block (MIB), in an other system information (OSI), in aphysical downlink control channel (PDCCH), in a physical downlink sharedchannel (PDSCH), during an RRC exchange between base station 205 and UE210, or in any combination thereof.

In some aspects, the indication may be carried in different carriersthan are used for the paging indication and response messages. Forexample, base station 205 may transmit the indication via an LTE/LTE-Aand/or NR network (e.g., sub-6 GHz network) and then the pagingindicator and response messages may be transmitted over a mmW wirelessnetwork (e.g., in a beamformed transmission).

At 220, base station 205 may transmit (and UE 210 may receive) a pagingindicator message. The paging indicator message may be transmitted toUE(s) within a group of UEs, e.g., to a group of UEs that includes UE210. In some aspects, the paging indicator may be transmitted on apaging indicator channel (PICH) and carry or otherwise convey anindication to UE 210 that there is a paging message on an associatedpaging channel.

In some aspects, the paging indicator is transmitted in a group-specificpaging signal. For example, base station 205 may inform UE 210 whetherit needs to be paged or not by including 40 bit UE identifier (ID) inthe PDSCH carrying the paging payload. When the UEs are divided intodifferent groups, if downlink data arrives for at least one UE (e.g., UE210), base station 205 may use N bits (N<=40) to page all UEs in thegroup to convey that at least one member of the group has downlink data.

At 225, UE 210 may select a format for the first response message. Forexample, the UE 210 may select a paging response message or a RACHmessage (e.g., msg1) to use to respond to the paging indicator. In someaspects, UE 210 may select a paging response message as the firstresponse message when, for example, the UE 210 does not have a currentneed to establish an active RRC connection with the base station 205,e.g., when the UE 210 does not have any uplink traffic to send, when thesystem settings are current or recently updated, and the like.

In some aspects, UE 210 may select a RACH message as the first responsemessage when, for example, UE 210 needs to establish an active RRCconnection with base station 205, e.g., when UE 210 has uplink trafficto send, to update system settings, and the like. Other considerationsmay also be included when determining the format for the first responsemessage, e.g., whether the first response message is a paging responsemessage or a RACH message.

At 230, UE 210 may transmit (and base station 205 may receive) the firstresponse message. The first response message may have a format based onstep 225 and may include either a paging response message or a RACHmessage. Thus, base station 205 may receive the first response messagethat may be a paging response message on resources that are shared withother UEs to transmit RACH messages.

At 235, base station 205 may transmit (and UE 210 may receive) a secondresponse message. The second response message may be based on the firstresponse message, e.g., based on a determination and/or assumption ofwhether the first response message was a paging response message or aRACH message. In some aspects, the second response message may be apaging message or a RACH message (e.g., a RACH msg2).

In some aspects, base station 205 may vary how it responds to the firstresponse message based on certain considerations. One example mayinclude the current paging load. For example, a high paging load mayindicate that the first response message was more likely a pagingresponse message and therefore a paging message as the second responsemessage is appropriate. On the contrary, a low paging load may indicatethat the first response message was more likely a RACH message (e.g.,msg1) and therefore a RACH message (msg2) as the second response messageis appropriate.

Another example may include the UE entry rate into the system. Forexample, base station 205 may determine that there is a high UE entryrate into the system (e.g., due to high mobility, handover, etc.) andbase the format for the second response message accordingly. A high UEentry rate into the system may indicate that the first response messagewas a RACH message (msg1) and therefore a RACH message (e.g., msg2) forthe second response message may be appropriate. On the contrary, a lowUE entry rate into the system may indicate that the first responsemessage was a paging response message and therefore a paging message forthe second response message is appropriate.

In some aspects, base station 205 may consider both of the paging loadand the UE entry rate when selecting a format for the second responsemessage.

In some aspects, the second response message may be a paging message.For example, the base station 205 may determine that the first responsemessage is a paging response message and respond with a paging messageas the second response message. UE 210 may receive the paging messageand respond with a RACH message (e.g., RACH msg1). Base station 205 mayrespond to the RACH msg1 with a RACH msg2 message as a third responsemessage to initiate an RRC connection procedure with UE 210. In someaspects, the second response message may comprise a random accessresponse message, such as a paging message.

In some aspects, the second response message may be a RACH message. Forexample, the base station 205 may determine that the first responsemessage is a RACH msg1 and respond with a RACH msg2 as the secondresponse message. UE 210 may receive the RACH msg2 and respond with amessage that carries or otherwise conveys an indication that the UE 210has responded to the paging indicator (e.g., previously responded). Basestation 205 may respond to the message with a paging message as thethird response message.

FIG. 3 illustrates an example of a flowchart 300 that supports resourcesharing between paging response and RACH message in accordance withvarious aspects of the present disclosure. In some examples, flowchart300 may implement aspects of wireless communication system 100 and/orprocess 200. Flowchart 300 may be implemented by a base station, whichmay be an example of the corresponding devices described herein.

At 305, the base station may transmit an indication of the sharedresources. The shared resource indicator may carry or otherwise conveyan indication that the resource is shared, e.g., between a pagingresponse message and a RACH message (e.g., RACH preamble message/msg1).The shared resource indicator may be transmitted in a RMSI, in a MIB, inan OSI, in a PDCCH, in a PDSCH, during an RRC exchange, and the like.

At 310, the base station may transmit a paging indicator message. Thepaging indicator message may be transmitted to UE(s) within a group ofUEs. In some aspects, the paging indicator may be transmitted on a PICHand carry or otherwise convey an indication to the group of UEs thatthere are paging messages on an associated paging channel.

At 315, the base station may receive a first response message from theUE, e.g., a first response message transmitted in response to the pagingindicator. The first response message may be a paging response messageor a RACH message (e.g., msg1). Thus, the base station may receive thefirst response message that may be a paging response message onresources that are shared with other UEs to transmit RACH messages.

At 320, the base station determine whether the paging load is high. Forexample, the base station may monitor the number of paging procedureshave been conducted with UEs over a predetermine time period, over asliding window, etc. In some aspects, the base station may determinewhether the paging load is high based on information received from anetwork (e.g., MME).

In some aspects, a high paging load may indicate that the first responsemessage was more likely a paging response message and therefore at 325the base station may transmit a paging message as the second responsemessage. For example, if the paging load is above a threshold level, thebase station may determine that the paging response message as the firstresponse messages are more common and therefore a paging message is mostlikely the best response.

On the contrary, a low paging load may indicate that the first responsemessage was more likely a RACH message (e.g., msg1) and therefore at 330the base station may transmit a RACH message (msg2) as the secondresponse message. For example, if the paging load is below a thresholdlevel, the base station may determine that the RACH msg1 as the firstresponse messages are more common and therefore a RACH msg2 is mostlikely the best response.

FIG. 4 illustrates an example of a flowchart 400 that supports resourcesharing between paging response and RACH message in accordance withvarious aspects of the present disclosure. In some examples, flowchart400 may implement aspects of wireless communication system 100 and/orprocess 200. Flowchart 400 may be implemented by a base station, whichmay be an example of the corresponding devices described herein.

At 405, the base station may transmit an indication of the sharedresources. The shared resource indicator may carry or otherwise conveyan indication that the resource is shared, e.g., between a pagingresponse message and a RACH message (e.g., RACH preamble message/msg1).The shared resource indicator may be transmitted in a RMSI, in a MIB, inan OSI, in a PDCCH, in a PDSCH, during an RRC exchange, and the like.

At 410, the base station may transmit a paging indicator message. Thepaging indicator message may be transmitted to UE(s) within a group ofUEs. In some aspects, the paging indicator may be transmitted on a PICHand carry or otherwise convey an indication to the group of UEs thatthere are paging messages on an associated paging channel.

At 415, the base station may receive a first response message from theUE, e.g., a first response message transmitted in response to the pagingindicator. The first response message may be a paging response messageor a RACH message (e.g., msg1). Thus, the base station may receive thefirst response message that may be a paging response message onresources that are shared with other UEs to transmit RACH messages.

At 420, the base station determine whether the UE entry rate for thesystem is high. For example, the base station may monitor the number ofinitial connection and/or reconnection requests received from UEs over apredetermine time period, over a sliding window, etc. In some aspects,the base station may determine whether the UE entry rate is high basedon information received from a network (e.g., MME).

In some aspects, a low UE entry rate may indicate that the firstresponse message was more likely a paging response message and thereforeat 425 the base station may transmit a paging message as the secondresponse message. For example, if the UE entry rate is below a thresholdlevel, the base station may determine that the paging response messageas the first response messages are more common and therefore a pagingmessage is most likely the best response.

On the contrary, a high UE entry rate may indicate that the firstresponse message was more likely a RACH message (e.g., msg1) andtherefore at 430 the base station may transmit a RACH message (msg2) asthe second response message. For example, if the UE entry rate is abovea threshold level, the base station may determine that the RACH msg1 asthe first response messages are more common and therefore a RACH msg2 ismost likely the best response.

FIG. 5 illustrates an example of a process 500 that supports resourcesharing between paging response and RACH message in accordance withvarious aspects of the present disclosure. In some examples, process 500may implement aspects of wireless communication system 100, process 200,and/or flowcharts 300/400, as described herein. Process 500 may includea base station 505 and a UE 510, which may be examples of thecorresponding devices described herein. Broadly, process 500 illustratesone example of false paging alert resolution in an RRC connectionprocedure.

In some aspects, index-based paging may improve downlink efficiency,e.g., particularly in a multi-beam scenario (e.g., mmW networks) wherebroadcast information is delivered via a beam sweeping operation. Insome aspects, process 500 may illustrate an index-based paging mechanismwhere verification of the paging alert is embedded in the pagingresponse procedure. This may avoid or minimize any additional signalingfor actual paging alerts.

In multi-beam scenarios, broadcast transmissions (such as is used fordelivery of paging messages) may be conducted via beam sweep. Due to thelarge number of beams on the gNB side (e.g., base station 505), thebroadcast transmissions may become inefficient. One example ofestimating the downlink capacity overhead associated with paging formulti-beam systems may include the paging overhead in multi-beamscenarios, e.g., using HF bands, depending on the number of beamdirections that the gNB is to sweep and the number of gNB antennaarrays. The number of synchronization signal (SS) block(s) in a SS burstset may be considered as an equivalent term to this ratio because gNBmay decide the number of SS blocks based on the number of directions itis to sweep and its number of antenna arrays. Hence, the same number ofSS blocks may be used instead of the number of beam directions and thenumber of antenna arrays to analyze the downlink paging overhead.

Factors to use when analyzing the downlink paging overhead may includethe number of SS blocks per SS burst set. The number of SS blocks maydenote the ratio of the number of downlink transmit beams and gNBantenna arrays that the gNB uses to transmit synchronization and pagingsignals. The UE identifier size (U) may also be used (e.g., the pagingmessage may include the UE identifier, which may be 40 bits in someexamples). The paging rate (P) may also be used, e.g., the number theUEs paged per second. The spectral efficiency (E) may also be used,which may be expressed in bits-per-second (bps)/Hz. This may allowfocusing on the cell edge spectral efficiency for the analysis. Thecarrier bandwidth (B) may also be used, which may be expressed in unitHz. Using these parameters, the downlink paging overhead may becalculated using the formula:

${{DL}\mspace{14mu}{Paging}\mspace{14mu}{Overhead}} = \frac{{Number}\mspace{14mu}{of}\mspace{14mu}{SS}\mspace{14mu}{{Blocks} \cdot {Paging}}\mspace{14mu}{{Rate} \cdot {UE}}\mspace{14mu}{ID}\mspace{14mu}{Size}}{{Spectral}\mspace{14mu}{{Efficiency} \cdot {Carrier}}\mspace{14mu}{Bandwidth}}$

In some LTE networks, each SS burst set may include only one SS block.However, in some mmW networks each SS burst set may have as many as 64SS blocks. On the other hand, LTE may use 20 MHz bandwidth whereas acomponent carrier of a mmW network may have 100 MHz bandwidth. The celledge spectral efficiency in an LTE network may be 0.1 bps/Hz. This maysuggest that spectral efficiency of 0.225 bps/Hz at the cell edge fornext generation networks (e.g., NR networks). Using this information, itmay be shown that LTE networks consume approximately 13% of downlinkcapacity at maximum paging rate of 6,400 UEs per second. In mmWnetworks, the downlink capacity demand for the same paging rate may besubstantially higher, e.g., up to 73% of the downlink capacity for 64 SSblocks. This is 5-6 times higher than the corresponding capacity demandfor paging in LTE networks.

To address this, aspects of the present disclosure may provide forreduction of the downlink overhead through compression of the pagingrecords. Such compression may be used on a hash applied to the UEidentifier, such as the S-TMSI (SAE temporary mobile subscriberidentity) or the IMSI (international mobile subscribers identity) thatis contained in the paging record. The compression may also be based ona truncation of the UE identifier. In some aspects, the compression maybe based on replacing the UE identifier with a group identifier, e.g.,when the UE has been associated with such a group at some point. Othercompression methods are possible. The compressed form of the UEidentifier may be referred to as a paging index and the paging broadcastmay contain only the paging indexes. After compression, the gNB maybroadcast a paging index of X bits instead of the UE identifier of 40bits (for example), which reduces the downlink paging overhead by afactor of 40/X. For example, if X=14 bits, the broadcast overhead isreduced by a factor of nearly three.

In some aspects, the gNB (e.g., base station 505) may also determine thepaging index size. For example, to obtain sufficiently large resourcegains in broadcasting the paging messages, lossy compression may beapplied. Such lossy compression may lead to false paging alerts since apaging index may map to multiple UE identifiers, among which only one ora subset of UEs were intended to be paged. False paging alerts due topaging index use based paging mechanisms may be reduced by appropriatelyselecting the paging index size. For example, LTE may transmit 16 pagingmessages in each paging occasion and the paging occasion may occur fourtimes in every 10 milliseconds (ms). For an index size of X bits, theprobability to receive a false paging alert may amount to approximately16*2^(−X). Assuming X=14 bits, the probability of a false alert becomesless than 10³, which translates into one false alert in more than1,000×320 ms=5½ minutes, e.g., in a worst-case scenario. Lower falsealert rates may be realized.

Since lossy compression may invoke some non-zero probability of falsepaging alerts, the UE may verify if such a false alert has occurred.This evaluation may use as little resources as possible, especially forgenuine paging alerts. Process 500 illustrates an index-based pagingmethod where the UE proceeds as if the paging alert was genuine andstarts with procedures to establish a connection to the network toretrieve the data that is waiting for delivery. The verification of thepaging alert may then be embedded into the standard connectionprocedures and, therefore no additional signaling is needed when thepaging alert was genuine. Thus, process 500 illustrates one example offalse paging alert resolution in RRC connection establishment procedure.

At 515, base station 505 (e.g., the gNB) may derive a paging index. Thepaging index list may be derived using some or all of the compressiontechniques discussed above.

At 520, base station 505 may transmit a paging index list. In someaspects, the paging index list may be broadcast and the broadcast maycarry or otherwise convey an indicator that compression was used orwhether the full paging record list is being transmitted (e.g., the fulllist of UE identifiers). This may provide for base station 505 to resortto more traditional paging approaches when the paging load is low. Thebroadcast may also include an indication of the UE identifier type thatis contained in the paging index list, e.g., S-TMSI, IMSI, etc. Thisindicator may be provided per index or per group of indices of the sametype.

At 525, the UE 510 may receive the paging alert and determine that thepaging index list indicates that a paging message is intended for UE510, e.g., that the paging message is genuine.

At 530, UE 510 may initiate a RACH procedure with base station 505 basedon receiving the index-based paging alert. The UE 505 may attempt toestablish the RRC connection to retrieve the data waiting for download.

At 535, the RACH procedure may include UE 510 transmitting a RACHmessage to base station 505. The RACH message may be a RRC connectionrequest message. The RACH message may include the UE identifier. In someaspects, the RACH message may include a paging response indicator, e.g.,an indicator that the RRC connection request message is being sent inresponse to the paging message.

At 540, the base station 505 may determine if the paging responsemessage includes a match. For example, since the RACH message includesthe UE identifier, the network may verify if this UE identifier matchesan entry in the paging record list. In case there is a match, thenetwork may accept the RRC connection request message and therefore noadditional overhead is introduced for genuine paging alerts. Thus, at545 the base station 505 may transmit a RRC connection setup message toestablish the RRC connection and at 550 the UE 510 may transmit a RRCconnection complete message to confirm establishment of the RRCconnection.

If, however, if no match is found, the network may conclude that thefalse paging alert has occurred and consequently may reject the RRCconnection request. For example and at 555, the base station 505 maytransmit a RRC connection reject message. The RRC connection rejectmessage may include the reason for the rejection. The overheadassociated with the unsuccessful connection establishment attemptremains as small as the false-page alert probability. This can be set bythe degree of compression applied to the paging message, e.g., the indexsize, as discussed above.

The network may apply the matching operation only for connectionestablishment attempts that occur in response to a paging broadcast. Todistinguish paging-based connection establishment attempts from those ofother nature(s), the UE 510 may include a paging response indicationwhen requesting the connection establishment. In some aspects, the basestation 505 may apply the matching operation only if this indication isincluded.

FIG. 6 illustrates an example of a process 600 that supports resourcesharing between paging response and RACH message in accordance withvarious aspects of the present disclosure. In some examples, process 600may implement aspects of wireless communication system 100, processes200/500, and/or flowcharts 300/400, as described herein. Process 200 mayinclude a base station 205 and a UE 210, which may be examples of thecorresponding devices described herein. Broadly, process 600 illustratesone example of false paging alert resolution in an RRC connectionprocedure. Generally, aspects of process 600 provide for an index-basedpaging mechanism with alert verification during the RACH procedure.

In some aspects, process 600 illustrates an example where index-basedpaging verification is embedded in the random-access procedure. The UE(e.g., UE 610) receiving the alert starts the random access procedure bysending a preamble on the random access channel. The UE selects thepreamble based on a mapping to the index that caused the paging alert.This mapping may be pre-configured by the network. In this manner, thegNB (e.g., base station 605) can find the associated paging index thatalerted the UE.

The gNB receiving the preamble in succession to a paging broadcastevaluates if the preamble matches a mappings to any of the pagingindexes broadcast before. In case such a match is found, the gNBincludes the paging record pertaining to this index in the random accessresponse (msg2). This allows the UE to verify if the paging alert wasgenuine or false. In case the paging alert was false, the UE includes aRandom-Access-Termination Indication into MSG 3 of the paging procedure.Otherwise it proceeds with the paging procedure and RRC connectionestablishment in conventional manner to retrieve data waiting for it onthe network.

At 615, base station 605 (e.g., the gNB) may derive a paging index. Thepaging index list may be derived using some or all of the compressiontechniques discussed above.

At 620, base station 605 may transmit a paging index list. In someaspects, the paging index list may be broadcast and the broadcast maycarry or otherwise convey an indicator that compression was used orwhether the full paging record list is being transmitted (e.g., the fulllist of UE identifiers). This may provide for base station 605 to resortto more traditional paging approaches when the paging load is low. Thebroadcast may also include an indication of the UE identifier type thatis contained in the paging index list, e.g., S-TMSI, IMSI, etc. Thisindicator may be provided per index or per group of indices of the sametype.

At 625, the UE 610 may receive the paging alert and determine that thepaging index list indicates that a paging message is intended for UE610, e.g., that the paging message is genuine. The UE 610 receiving thepaging alert may start the random access procedure where, at 630, the UE610 transmits a RACH preamble to base station 605 on the PRACH. UE 610may select the preamble based on a mapping to the index that caused thepaging alert. This mapping may be pre-configured by the network. In thismanner, the base station 605 may find the associated paging index thatalerted the UE 610.

At 635, base station 605 determines if a preamble match has occurred.For example, base station 610 may evaluate if the RACH preamble matchesmapping to the paging index list. In some aspects, base station 610receiving the RACH preamble in succession to a paging broadcast mayprovide for the base station 605 to evaluate if the preamble matches amapping to any of the paging indexes broadcast before. In case such amatch is found, at 640 the base station 610 may include the pagingrecord pertaining to this paging index in the random access response(RAR) message (e.g., RACH msg2). This allows the UE 610 to verify if thepaging alert was genuine or false. In case the paging alert was false,at 645 the base station 605 transmits the RAR without the paging record.

At 650, the UE 610 determines whether the RAR included the pagingrecord. In the case that the RAR did not include the paging record, at660 the UE 605 may transmit a RACH message 3 that includes aRandom-Access-Termination Indication of the paging procedure. Otherwiseif the RAR did include the paging record, at 655 the UE 610 may proceedwith the paging procedure and RRC connection establishment inconventional manner to retrieve data waiting for it on the network bytransmitting a RACH msg3.

FIG. 7 shows a block diagram 700 of a wireless device 705 that supportsresource sharing between paging response and random access channelmessage in accordance with aspects of the present disclosure. Wirelessdevice 705 may be an example of aspects of a base station 105 asdescribed herein. Wireless device 705 may include receiver 710, basestation resource manager 715, and transmitter 720. Wireless device 705may also include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 710 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to resourcesharing between paging response and random access channel message,etc.). Information may be passed on to other components of the device.The receiver 710 may be an example of aspects of the transceiver 1035described with reference to FIG. 10. The receiver 710 may utilize asingle antenna or a set of antennas.

Base station resource manager 715 may be an example of aspects of thebase station resource manager 1015 described with reference to FIG. 10.

Base station resource manager 715 and/or at least some of its varioussub-components may be implemented in hardware, software executed by aprocessor, firmware, or any combination thereof. If implemented insoftware executed by a processor, the functions of the base stationresource manager 715 and/or at least some of its various sub-componentsmay be executed by a general-purpose processor, a digital signalprocessor (DSP), an application-specific integrated circuit (ASIC), anfield-programmable gate array (FPGA) or other programmable logic device,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described in thepresent disclosure. The base station resource manager 715 and/or atleast some of its various sub-components may be physically located atvarious positions, including being distributed such that portions offunctions are implemented at different physical locations by one or morephysical devices. In some examples, base station resource manager 715and/or at least some of its various sub-components may be a separate anddistinct component in accordance with various aspects of the presentdisclosure. In other examples, base station resource manager 715 and/orat least some of its various sub-components may be combined with one ormore other hardware components, including but not limited to an I/Ocomponent, a transceiver, a network server, another computing device,one or more other components described in the present disclosure, or acombination thereof in accordance with various aspects of the presentdisclosure.

Base station resource manager 715 may transmit a paging indicatormessage to UE(s) in a group of UEs. Base station resource manager 715may receive, based on the paging indicator message, a first responsemessage from the one or more UEs, the first response message receivedusing a resource that is shared with a RACH message for the group ofUEs. Base station resource manager 715 may transmit, based on the firstresponse message, a second response message to the one or more UEs.

Transmitter 720 may transmit signals generated by other components ofthe device. In some examples, the transmitter 720 may be collocated witha receiver 710 in a transceiver module. For example, the transmitter 720may be an example of aspects of the transceiver 1035 described withreference to FIG. 10. The transmitter 720 may utilize a single antennaor a set of antennas.

FIG. 8 shows a block diagram 800 of a wireless device 805 that supportsresource sharing between paging response and random access channelmessage in accordance with aspects of the present disclosure. Wirelessdevice 805 may be an example of aspects of a wireless device 705 or abase station 105 as described herein. Wireless device 805 may includereceiver 810, base station resource manager 815, and transmitter 820.Wireless device 805 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 810 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to resourcesharing between paging response and random access channel message,etc.). Information may be passed on to other components of the device.The receiver 810 may be an example of aspects of the transceiver 1035described with reference to FIG. 10. The receiver 810 may utilize asingle antenna or a set of antennas.

Base station resource manager 815 may be an example of aspects of thebase station resource manager 1015 described with reference to FIG. 10.Base station resource manager 815 may also include paging indicatormanager 825, first response manager 830, and second response manager835.

Paging indicator manager 825 may transmit, from a base station, a pagingindicator message to one or more UEs in a group of UEs.

First response manager 830 may receive, based on the paging indicatormessage, a first response message from the one or more UEs, the firstresponse message received using a resource that is shared with a RACHmessage for the group of UEs.

Second response manager 835 may transmit, based on the first responsemessage, a second response message to the one or more UEs.

Transmitter 820 may transmit signals generated by other components ofthe device. In some examples, the transmitter 820 may be collocated witha receiver 810 in a transceiver module. For example, the transmitter 820may be an example of aspects of the transceiver 1035 described withreference to FIG. 10. The transmitter 820 may utilize a single antennaor a set of antennas.

FIG. 9 shows a block diagram 900 of a base station resource manager 915that supports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.The base station resource manager 915 may be an example of aspects of abase station resource manager 715, a base station resource manager 815,or a base station resource manager 1015 described with reference toFIGS. 7, 8, and 10. The base station resource manager 915 may includepaging indicator manager 920, first response manager 925, secondresponse manager 930, shared resource indication manager 935, and secondresponse format manager 940. Each of these modules may communicate,directly or indirectly, with one another (e.g., via one or more buses).

Paging indicator manager 920 may transmit, from a base station, a pagingindicator message to one or more UEs in a group of UEs.

First response manager 925 may receive, based on the paging indicatormessage, a first response message from the one or more UEs, the firstresponse message received using a resource that is shared with a RACHmessage for the group of UEs.

Second response manager 930 may transmit, based on the first responsemessage, a second response message to the one or more UEs.

Shared resource indication manager 935 may transmit an indication of theresource that is shared between the paging response message and the RACHmessage. In some cases, the indication of the resource is transmitted inat least one of a RMSI, or a MIB, or an OSI, or a PDCCH, or a PDSCH, ora RRC message exchange, or a combination thereof.

Second response format manager 940 may select a format for the secondresponse message based on a current paging load, an UE entry rate, or acombination thereof. Second response format manager 940 may transmit arandom access response message as the second response message, where therandom access response message includes a paging record. Second responseformat manager 940 may determine that the first response messagecomprises a paging response message, wherein the random access responsemessage is transmitted based at least in part on the determining. Secondresponse format manager 940 may match a RACH preamble of the firstresponse message to a set of pre-allocated RACH preambles for a RACHmsg1, wherein the determining that the first response message comprisesa paging response message based at least in part on the matching. Secondresponse format manager 940 may receive a RACH msg3 from the UE based atleast in part on the paging record being associated with the UE. Secondresponse format manager 940 may receive a RACH msg3 from the UE thatcomprises a RACH termination indication based at least in part on thepaging record not being associated with the UE.

In some aspects, second response format manager 940 may transmit apaging message as the second response message, receive, based on thepaging message, a RACH msg1 from the one or more UEs, and transmit aRACH msg2 as a third response message. Second response format manager940 may determine that the first response message includes a RACH msg1.Second response format manager 940 may determine that the first responsemessage includes a paging response message. Second response formatmanager 940 may receive, based on the RACH msg2, a message from the oneor more UEs, where the message conveys an indication that the one ormore UEs has responded to the paging indicator. Second response formatmanager 940 may transmit a paging message as a third response message,receive, based on the RACH msg2, a RACH msg3 from the one or more UEs,transmit a connection establishment message as a third response message,and transmit a RACH msg2 as the second response message. In someexamples, the paging message is transmitted in a RACH message. In someexamples, the RACH message is a RACH preamble message

FIG. 10 shows a diagram of a system 1000 including a device 1005 thatsupports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.Device 1005 may be an example of or include the components of wirelessdevice 705, wireless device 805, or a base station 105 as describedherein. Device 1005 may include components for bi-directional voice anddata communications including components for transmitting and receivingcommunications, including base station resource manager 1015, processor1020, memory 1025, software 1030, transceiver 1035, antenna 1040,network communications manager 1045, and inter-station communicationsmanager 1050. These components may be in electronic communication viaone or more busses (e.g., bus 1010). Device 1005 may communicatewirelessly with one or more UEs 115.

Processor 1020 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a central processing unit (CPU), amicrocontroller, an ASIC, an FPGA, a programmable logic device, adiscrete gate or transistor logic component, a discrete hardwarecomponent, or any combination thereof). In some cases, processor 1020may be configured to operate a memory array using a memory controller.In other cases, a memory controller may be integrated into processor1020. Processor 1020 may be configured to execute computer-readableinstructions stored in a memory to perform various functions (e.g.,functions or tasks supporting resource sharing between paging responseand random access channel message).

Memory 1025 may include random access memory (RAM) and read only memory(ROM). The memory 1025 may store computer-readable, computer-executablesoftware 1030 including instructions that, when executed, cause theprocessor to perform various functions described herein. In some cases,the memory 1025 may contain, among other things, a basic input/outputsystem (BIOS) which may control basic hardware and/or software operationsuch as the interaction with peripheral components or devices.

Software 1030 may include code to implement aspects of the presentdisclosure, including code to support resource sharing between pagingresponse and random access channel message. Software 1030 may be storedin a non-transitory computer-readable medium such as system memory orother memory. In some cases, the software 1030 may not be directlyexecutable by the processor but may cause a computer (e.g., whencompiled and executed) to perform functions described herein.

Transceiver 1035 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1035 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1035 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1040.However, in some cases the device may have more than one antenna 1040,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

Network communications manager 1045 may manage communications with thecore network (e.g., via one or more wired backhaul links). For example,the network communications manager 1045 may manage the transfer of datacommunications for client devices, such as one or more UEs 115.

Inter-station communications manager 1050 may manage communications withother base station 105, and may include a controller or scheduler forcontrolling communications with UEs 115 in cooperation with other basestations 105. For example, the inter-station communications manager 1050may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, inter-station communications manager1050 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

FIG. 11 shows a block diagram 1100 of a wireless device 1105 thatsupports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.Wireless device 1105 may be an example of aspects of a UE 115 asdescribed herein. Wireless device 1105 may include receiver 1110, UEresource manager 1115, and transmitter 1120. Wireless device 1105 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 1110 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to resourcesharing between paging response and random access channel message,etc.). Information may be passed on to other components of the device.The receiver 1110 may be an example of aspects of the transceiver 1435described with reference to FIG. 14. The receiver 1110 may utilize asingle antenna or a set of antennas.

UE resource manager 1115 may be an example of aspects of the UE resourcemanager 1415 described with reference to FIG. 14.

UE resource manager 1115 and/or at least some of its varioussub-components may be implemented in hardware, software executed by aprocessor, firmware, or any combination thereof. If implemented insoftware executed by a processor, the functions of the UE resourcemanager 1115 and/or at least some of its various sub-components may beexecuted by a general-purpose processor, a DSP, an ASIC, an FPGA orother programmable logic device, discrete gate or transistor logic,discrete hardware components, or any combination thereof designed toperform the functions described in the present disclosure. The UEresource manager 1115 and/or at least some of its various sub-componentsmay be physically located at various positions, including beingdistributed such that portions of functions are implemented at differentphysical locations by one or more physical devices. In some examples, UEresource manager 1115 and/or at least some of its various sub-componentsmay be a separate and distinct component in accordance with variousaspects of the present disclosure. In other examples, UE resourcemanager 1115 and/or at least some of its various sub-components may becombined with one or more other hardware components, including but notlimited to an I/O component, a transceiver, a network server, anothercomputing device, one or more other components described in the presentdisclosure, or a combination thereof in accordance with various aspectsof the present disclosure.

UE resource manager 1115 may receive, at a UE, an indication of aresource that is shared with a RACH message. UE resource manager 1115may receive, from a base station, a paging indicator message. UEresource manager 1115 may select at least one of the paging responsemessage or the RACH message as a first response message to the pagingindicator message. UE resource manager 1115 may transmit the firstresponse message to the base station using the resource.

Transmitter 1120 may transmit signals generated by other components ofthe device. In some examples, the transmitter 1120 may be collocatedwith a receiver 1110 in a transceiver module. For example, thetransmitter 1120 may be an example of aspects of the transceiver 1435described with reference to FIG. 14. The transmitter 1120 may utilize asingle antenna or a set of antennas.

FIG. 12 shows a block diagram 1200 of a wireless device 1205 thatsupports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.Wireless device 1205 may be an example of aspects of a wireless device1105 or a UE 115 as described herein. Wireless device 1205 may includereceiver 1210, UE resource manager 1215, and transmitter 1220. Wirelessdevice 1205 may also include a processor. Each of these components maybe in communication with one another (e.g., via one or more buses).

Receiver 1210 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to resourcesharing between paging response and random access channel message,etc.). Information may be passed on to other components of the device.The receiver 1210 may be an example of aspects of the transceiver 1435described with reference to FIG. 14. The receiver 1210 may utilize asingle antenna or a set of antennas.

UE resource manager 1215 may be an example of aspects of the UE resourcemanager 1415 described with reference to FIG. 14. UE resource manager1215 may also include shared resource indication manager 1225, pagingindicator manager 1230, and first response manager 1235.

Shared resource indication manager 1225 may receive, at a UE, anindication of a resource that is shared with a RACH message. Sharedresource indication manager 1225 may receive the indication of theresource in at least one of a RMSI, or a MIB, or an OSI, or a PDCCH, ora PDSCH, or a RRC message exchange, or a combination thereof.

Paging indicator manager 1230 may receive, from a base station, a pagingindicator message.

First response manager 1235 may select at least one of the pagingresponse message or the RACH message as a first response message to thepaging indicator message and transmit the first response message to thebase station using the resource.

Transmitter 1220 may transmit signals generated by other components ofthe device. In some examples, the transmitter 1220 may be collocatedwith a receiver 1210 in a transceiver module. For example, thetransmitter 1220 may be an example of aspects of the transceiver 1435described with reference to FIG. 14. The transmitter 1220 may utilize asingle antenna or a set of antennas.

FIG. 13 shows a block diagram 1300 of a UE resource manager 1315 thatsupports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.The UE resource manager 1315 may be an example of aspects of a UEresource manager 1415 described with reference to FIGS. 11, 12, and 14.The UE resource manager 1315 may include shared resource indicationmanager 1320, paging indicator manager 1325, first response manager1330, and second response manager 1335. Each of these modules maycommunicate, directly or indirectly, with one another (e.g., via one ormore buses).

Shared resource indication manager 1320 may receive, at a UE, anindication of a resource that is shared with a RACH message. Sharedresource indication manager 1320 may receive the indication of theresource in at least one of a RMSI, or a MIB, or an OSI, or a PDCCH, ora PDSCH, or a RRC message exchange, or a combination thereof.

Paging indicator manager 1325 may receive, from a base station, a pagingindicator message.

First response manager 1330 may select at least one of the pagingresponse message or the RACH message as a first response message to thepaging indicator message and transmit the first response message to thebase station using the resource.

Second response manager 1335 may receive a second response message fromthe base station and select, based on the second response message, athird response message for transmission to the base station, the thirdresponse message including a RACH msg1, a RACH msg3, or a messageconveying an indication that the UE has responded to the pagingindicator.

FIG. 14 shows a diagram of a system 1400 including a device 1405 thatsupports resource sharing between paging response and random accesschannel message in accordance with aspects of the present disclosure.Device 1405 may be an example of or include the components of UE 115 asdescribed herein. Device 1405 may include components for bi-directionalvoice and data communications including components for transmitting andreceiving communications, including UE resource manager 1415, processor1420, memory 1425, software 1430, transceiver 1435, antenna 1440, andI/O controller 1445. These components may be in electronic communicationvia one or more busses (e.g., bus 1410). Device 1405 may communicatewirelessly with one or more base stations 105.

Processor 1420 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, processor 1420 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into processor 1420. Processor 1420 may be configured toexecute computer-readable instructions stored in a memory to performvarious functions (e.g., functions or tasks supporting resource sharingbetween paging response and random access channel message).

Memory 1425 may include RAM and ROM. The memory 1425 may storecomputer-readable, computer-executable software 1430 includinginstructions that, when executed, cause the processor to perform variousfunctions described herein. In some cases, the memory 1425 may contain,among other things, a BIOS which may control basic hardware and/orsoftware operation such as the interaction with peripheral components ordevices.

Software 1430 may include code to implement aspects of the presentdisclosure, including code to support resource sharing between pagingresponse and random access channel message. Software 1430 may be storedin a non-transitory computer-readable medium such as system memory orother memory. In some cases, the software 1430 may not be directlyexecutable by the processor but may cause a computer (e.g., whencompiled and executed) to perform functions described herein.

Transceiver 1435 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1435 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1435 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1440.However, in some cases the device may have more than one antenna 1440,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

I/O controller 1445 may manage input and output signals for device 1405.I/O controller 1445 may also manage peripherals not integrated intodevice 1405. In some cases, I/O controller 1445 may represent a physicalconnection or port to an external peripheral. In some cases, I/Ocontroller 1445 may utilize an operating system such as iOS®, ANDROID®,MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operatingsystem. In other cases, I/O controller 1445 may represent or interactwith a modem, a keyboard, a mouse, a touchscreen, or a similar device.In some cases, I/O controller 1445 may be implemented as part of aprocessor. In some cases, a user may interact with device 1405 via I/Ocontroller 1445 or via hardware components controlled by I/O controller1445.

FIG. 15 shows a flowchart illustrating a method 1500 for resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure. The operations ofmethod 1500 may be implemented by a base station 105 or its componentsas described herein. For example, the operations of method 1500 may beperformed by a base station resource manager as described with referenceto FIGS. 7 through 10. In some examples, a base station 105 may executea set of codes to control the functional elements of the device toperform the functions described below. Additionally or alternatively,the base station 105 may perform aspects of the functions describedbelow using special-purpose hardware.

At block 1505 the base station 105 may transmit, from a base station, apaging indicator message to one or more UEs in a group of UEs. Theoperations of block 1505 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1505 may be performed by a paging indicator manager as describedwith reference to FIGS. 7 through 10.

At block 1510 the base station 105 may receive, based at least in parton the paging indicator message, a first response message from the oneor more UEs, the first response message received using a resource thatis shared with a RACH message for the group of UEs. The operations ofblock 1510 may be performed according to the methods described herein.In certain examples, aspects of the operations of block 1510 may beperformed by a first response manager as described with reference toFIGS. 7 through 10.

At block 1515 the base station 105 may transmit, based at least in parton the first response message, a second response message to the one ormore UEs. The operations of block 1515 may be performed according to themethods described herein. In certain examples, aspects of the operationsof block 1515 may be performed by a second response manager as describedwith reference to FIGS. 7 through 10.

FIG. 16 shows a flowchart illustrating a method 1600 for resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure. The operations ofmethod 1600 may be implemented by a base station 105 or its componentsas described herein. For example, the operations of method 1600 may beperformed by a base station resource manager as described with referenceto FIGS. 7 through 10. In some examples, a base station 105 may executea set of codes to control the functional elements of the device toperform the functions described below. Additionally or alternatively,the base station 105 may perform aspects of the functions describedbelow using special-purpose hardware.

At block 1605 the base station 105 may transmit an indication of theresource that is shared between the paging response message and the RACHmessage. The operations of block 1605 may be performed according to themethods described herein. In certain examples, aspects of the operationsof block 1605 may be performed by a shared resource indication manageras described with reference to FIGS. 7 through 10.

At block 1610 the base station 105 may transmit, from a base station, apaging indicator message to one or more UEs in a group of UEs. Theoperations of block 1610 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1610 may be performed by a paging indicator manager as describedwith reference to FIGS. 7 through 10.

At block 1615 the base station 105 may receive, based at least in parton the paging indicator message, a first response message from the oneor more UEs, the first response message received using a resource thatis shared with a RACH message for the group of UEs. The operations ofblock 1615 may be performed according to the methods described herein.In certain examples, aspects of the operations of block 1615 may beperformed by a first response manager as described with reference toFIGS. 7 through 10.

At block 1620 the base station 105 may transmit, based at least in parton the first response message, a second response message to the one ormore UEs. The operations of block 1620 may be performed according to themethods described herein. In certain examples, aspects of the operationsof block 1620 may be performed by a second response manager as describedwith reference to FIGS. 7 through 10.

FIG. 17 shows a flowchart illustrating a method 1700 for resourcesharing between paging response and random access channel message inaccordance with aspects of the present disclosure. The operations ofmethod 1700 may be implemented by a UE 115 or its components asdescribed herein. For example, the operations of method 1700 may beperformed by a UE resource manager as described with reference to FIGS.11 through 14. In some examples, a UE 115 may execute a set of codes tocontrol the functional elements of the device to perform the functionsdescribed below. Additionally or alternatively, the UE 115 may performaspects of the functions described below using special-purpose hardware.

At block 1705 the UE 115 may receive an indication of a resource that isshared with a RACH message. The operations of block 1705 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of block 1705 may be performed by ashared resource indication manager as described with reference to FIGS.11 through 14.

At block 1710 the UE 115 may receive, from a base station, a pagingindicator message. The operations of block 1710 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of block 1710 may be performed by a paging indicatormanager as described with reference to FIGS. 11 through 14.

At block 1715 the UE 115 may select at least one of the paging responsemessage or the RACH message as a first response message to the pagingindicator message. The operations of block 1715 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of block 1715 may be performed by a first responsemanager as described with reference to FIGS. 11 through 14.

At block 1720 the UE 115 may transmit the first response message to thebase station using the resource. The operations of block 1720 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of block 1720 may be performed by afirst response manager as described with reference to FIGS. 11 through14.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Furthermore, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunication systems such as code division multiple access (CDMA), timedivision multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.The terms “system” and “network” are often used interchangeably. A codedivision multiple access (CDMA) system may implement a radio technologysuch as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc.CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releasesmay be commonly referred to as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) iscommonly referred to as CDMA2000 1×EV-DO, High Rate Packet Data (HRPD),etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. ATDMA system may implement a radio technology such as Global System forMobile Communications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE and LTE-A are releases of UMTSthat use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR, and GSM aredescribed in documents from the organization named “3rd GenerationPartnership Project” (3GPP). CDMA2000 and UMB are described in documentsfrom an organization named “3rd Generation Partnership Project 2”(3GPP2). The techniques described herein may be used for the systems andradio technologies mentioned above as well as other systems and radiotechnologies. While aspects of an LTE or an NR system may be describedfor purposes of example, and LTE or NR terminology may be used in muchof the description, the techniques described herein are applicablebeyond LTE or NR applications.

In LTE/LTE-A networks, including such networks described herein, theterm evolved node B (eNB) may be generally used to describe the basestations. The wireless communication system or systems described hereinmay include a heterogeneous LTE/LTE-A or NR network in which differenttypes of eNBs provide coverage for various geographical regions. Forexample, each eNB, next generation NodeB (gNB), or base station mayprovide communication coverage for a macro cell, a small cell, or othertypes of cell. The term “cell” may be used to describe a base station, acarrier or component carrier associated with a base station, or acoverage area (e.g., sector, etc.) of a carrier or base station,depending on context.

Base stations may include or may be referred to by those skilled in theart as a base transceiver station, a radio base station, an accesspoint, a radio transceiver, a NodeB, eNodeB (eNB), gNB, Home NodeB, aHome eNodeB, or some other suitable terminology. The geographic coveragearea for a base station may be divided into sectors making up only aportion of the coverage area. The wireless communication system orsystems described herein may include base stations of different types(e.g., macro or small cell base stations). The UEs described herein maybe able to communicate with various types of base stations and networkequipment including macro eNBs, small cell eNBs, gNBs, relay basestations, and the like. There may be overlapping geographic coverageareas for different technologies.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEswith service subscriptions with the network provider. A small cell is alower-powered base station, as compared with a macro cell, that mayoperate in the same or different (e.g., licensed, unlicensed, etc.)frequency bands as macro cells. Small cells may include pico cells,femto cells, and micro cells according to various examples. A pico cell,for example, may cover a small geographic area and may allowunrestricted access by UEs with service subscriptions with the networkprovider. A femto cell may also cover a small geographic area (e.g., ahome) and may provide restricted access by UEs having an associationwith the femto cell (e.g., UEs in a closed subscriber group (CSG), UEsfor users in the home, and the like). An eNB for a macro cell may bereferred to as a macro eNB. An eNB for a small cell may be referred toas a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB maysupport one or multiple (e.g., two, three, four, and the like) cells(e.g., component carriers).

The wireless communication system or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations may have similar frame timing, andtransmissions from different base stations may be approximately alignedin time. For asynchronous operation, the base stations may havedifferent frame timing, and transmissions from different base stationsmay not be aligned in time. The techniques described herein may be usedfor either synchronous or asynchronous operations.

The downlink transmissions described herein may also be called forwardlink transmissions while the uplink transmissions may also be calledreverse link transmissions. Each communication link describedherein—including, for example, wireless communication system 100 of FIG.1—may include one or more carriers, where each carrier may be a signalmade up of multiple sub-carriers (e.g., waveform signals of differentfrequencies).

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA or other programmablelogic device, discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. A general-purpose processor may be a microprocessor,but in the alternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations. Also, as used herein, including in the claims, “or” as usedin a list of items (for example, a list of items prefaced by a phrasesuch as “at least one of” or “one or more of”) indicates an inclusivelist such that, for example, a list of at least one of A, B, or C meansA or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, asused herein, the phrase “based on” shall not be construed as a referenceto a closed set of conditions. For example, an exemplary step that isdescribed as “based on condition A” may be based on both a condition Aand a condition B without departing from the scope of the presentdisclosure. In other words, as used herein, the phrase “based on” shallbe construed in the same manner as the phrase “based at least in parton.”

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media maycomprise RAM, ROM, electrically erasable programmable read only memory(EEPROM), compact disk (CD) ROM or other optical disk storage, magneticdisk storage or other magnetic storage devices, or any othernon-transitory medium that can be used to carry or store desired programcode means in the form of instructions or data structures and that canbe accessed by a general-purpose or special-purpose computer, or ageneral-purpose or special-purpose processor. Also, any connection isproperly termed a computer-readable medium. For example, if the softwareis transmitted from a website, server, or other remote source using acoaxial cable, fiber optic cable, twisted pair, digital subscriber line(DSL), or wireless technologies such as infrared, radio, and microwave,then the coaxial cable, fiber optic cable, twisted pair, DSL, orwireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include CD, laser disc, optical disc, digital versatile disc (DVD),floppy disk and Blu-ray disc where disks usually reproduce datamagnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication, comprising:transmitting, from a base station, an indication of a resourceassociated with a physical random access channel (PRACH) that isreserved for both and shared between a paging response message and arandom access channel (RACH) message; transmitting, from the basestation, a paging indicator message to one or more user equipment (UEs)in a group of UEs, the paging indicator message comprising a compressedpaging index corresponding to the group of UEs; receiving, based atleast in part on the paging indicator message, a first response messagefrom the one or more UEs, the first response message received using theresource that is shared with the RACH message and the paging responsemessage for the group of UEs; and transmitting, based at least in parton the first response message, a second response message to the one ormore UEs.
 2. The method of claim 1, wherein: the indication of theresource is transmitted in at least one of a remaining minimum systeminformation (RMSI), or a master information block (MIB), or an othersystem information (OSI), or a physical downlink control channel(PDCCH), or a physical downlink shared channel (PDSCH), or a radioresource control (RRC) message exchange, or a combination thereof. 3.The method of claim 1, further comprising: selecting a format for thesecond response message based at least in part on a current paging load,an UE entry rate, or a combination thereof.
 4. The method of claim 1,further comprising: determining that the first response messagecomprises the paging response message; and transmitting a paging messageas the second response message.
 5. The method of claim 4, furthercomprising: receiving, based at least in part on the paging message, aRACH msg1 from the one or more UEs; and transmitting a RACH msg2 as athird response message.
 6. The method of claim 1, further comprising:determining that the first response message comprises a RACH msg1; andtransmitting a RACH msg2 as the second response message.
 7. The methodof claim 6, further comprising: receiving, based at least in part on theRACH msg2, a message from the one or more UEs, wherein the messageconveys an indication that the one or more UEs has responded to thepaging indicator message.
 8. The method of claim 7, further comprising:transmitting a paging message as a third response message.
 9. The methodof claim 8, wherein the paging message is transmitted in the RACHmessage.
 10. The method of claim 9, wherein the RACH message comprises aRACH preamble message.
 11. The method of claim 6, further comprising:receiving, based at least in part on the RACH msg2, a RACH msg3 from theone or more UEs; and transmitting a connection establishment message asa third response message.
 12. The method of claim 1, further comprising:transmitting a random access response message as the second responsemessage, wherein the random access response message comprises a pagingrecord.
 13. The method of claim 12, further comprising: determining thatthe first response message comprises a paging response message, whereinthe random access response message is transmitted based at least in parton the determining.
 14. The method of claim 13, further comprising:matching a RACH preamble of the first response message to a set ofpre-allocated RACH preambles for a RACH msg1, wherein the determiningthat the first response message comprises the paging response messagebased at least in part on the matching.
 15. The method of claim 12,further comprising: receiving a RACH msg3 from the one or more UEs basedat least in part on the paging record being associated with the UE. 16.The method of claim 12, further comprising: receiving a RACH msg3 fromthe UE that comprises a RACH termination indication based at least inpart on the paging record not being associated with the UE.
 17. Themethod of claim 1, wherein the paging indicator message is transmittedto the group of UEs in a group-specific paging signal.
 18. An apparatusfor wireless communication, comprising: means for transmitting anindication of a resource associated with a physical random accesschannel (PRACH) that is reserved for both and shared between a pagingresponse message and a random access channel (RACH) message; means fortransmitting a paging indicator message to one or more user equipment(UEs) in a group of UEs, the paging indicator message comprising acompressed paging index corresponding to the group of UEs; means forreceiving, based at least in part on the paging indicator message, afirst response message from the one or more UEs, the first responsemessage received using the resource that is shared with the RACH messageand the paging response message for the group of UEs; and means fortransmitting, based at least in part on the first response message, asecond response message to the one or more UEs.
 19. The apparatus ofclaim 18, wherein: the indication of the resource is transmitted in atleast one of a remaining minimum system information (RMSI), or a masterinformation block (MIB), or an other system information (OSI), or aphysical downlink control channel (PDCCH), or a physical downlink sharedchannel (PDSCH), or a radio resource control (RRC) message exchange, ora combination thereof.
 20. The apparatus of claim 18, furthercomprising: means for selecting a format for the second response messagebased at least in part on a current paging load, an UE entry rate, or acombination thereof.
 21. The apparatus of claim 18, further comprising:means for determining that the first response message comprises thepaging response message; and means for transmitting a paging message asthe second response message.
 22. The apparatus of claim 21, furthercomprising: means for receiving, based at least in part on the pagingmessage, a RACH msg1 from the one or more UEs; and means fortransmitting a RACH msg2 as a third response message.